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            <h3 class="mb-0">React中useState如何给对象中的某一个属性赋值</h3>
            
            <small class="text-muted">发布于 2021-01-02</small>
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        <article>
            <h3 id="问题描述">问题描述</h3>
<p>在React文件中使用了useState，定义了查询条件，这个查询条件实际上是一个对象，如下所示</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-js" data-lang="js"><span style="display:flex;"><span><span style="color:#66d9ef">const</span> [<span style="color:#a6e22e">requestParam</span>, <span style="color:#a6e22e">setRequestParam</span>] <span style="color:#f92672">=</span> <span style="color:#a6e22e">useState</span>({
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">pageNum</span><span style="color:#f92672">:</span> <span style="color:#ae81ff">1</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">pageSize</span><span style="color:#f92672">:</span> <span style="color:#ae81ff">2</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">startTime</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#34;&#34;</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">endTime</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#34;&#34;</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">mobile</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#34;&#34;</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">sort</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#34;&#34;</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">sortField</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#34;&#34;</span>
</span></span><span style="display:flex;"><span>     
</span></span><span style="display:flex;"><span>});
</span></span></code></pre></div><p>这些参数是查询接口的请求参数，在一般情况下，我们只需要更新其中一个属性的值，在使用setRequestParam修改这些值时，会提示需要给所有参数赋值，如何才能更新某一个值呢？</p>
<h3 id="问题解决">问题解决</h3>
<p>通过Google查询了一下，终于在stackoverflow网站上，看到了大佬们的解答，问题是两年前的问题，我从中找一个容易理解答案，如下所示</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-js" data-lang="js"><span style="display:flex;"><span><span style="color:#a6e22e">setRequestParam</span>(<span style="color:#a6e22e">param</span> =&gt; ({
</span></span><span style="display:flex;"><span>    ...<span style="color:#a6e22e">param</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#75715e">//如果我要改变mobile的值可以这样写
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>    <span style="color:#a6e22e">mobile</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;13100008888&#39;</span>
</span></span><span style="display:flex;"><span>}));
</span></span></code></pre></div><p>看到上面的答案，应该知道采用es中的解构赋值来更新某个值</p>

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